Axel I'm thinking of doing irrigation too. It looks like there's a 3pt attachment made to cut ground and has a tube to feed pipe. Looks like you'll need to have someone in the seat and one to feed pipe. Looks like a good investment for the money.
I made my own using a ripper and large electrical conduit elbow. If you're interested I can load my video to YouTube and send you a link. We buried a 3/4" flexible hose from my rainwater collection system to the gardens 700 feet away.